Infinite Login Loop on Windows Terminal Server

Heyho together,

im actually trying to get a nextcloud client to work on a window server.

I can install the client and connect to the server + login into my account. Everythings working. Since this is a terminal server, there are multiple c,lients, working with this Nextcloud Client.

But when i login with another user and try to connect the client with the Server ill get stuck inside of an infinite login loop. It redirects me to the server URL, ill login and after a success ill get redirected to the client and again to the website where i have to login again and so on.

Can someone help me with this problem?